Listen in with a DIY FM Radio Transmitter
Although many people try and investigate the actions of others using the Internet, cracking passwords and so on, nothing beats good old fashioned espionage and with that in mind is this FM radio transmitter. Naturally it has other applications such as a baby monitor, one-way front door intercom or just to fool about with a car radio. Using a minimum of parts and powered by a simple coin battery, this transmitter can operate on a frequency of between 80 and 150 MHz, with a range up to 100m.
It is easy to build and only requires a few components, some stripboard and soldering. To get started, see the instructions page here. And for more news, updates and items of interest.please follow us on twitter, Facebook and Google+.
If you are interested in analogue electronics such as the radio bug described, a great starting point is the book "Getting Started in Electronics" by Forrest Mims III:
Over 128 pages he teaches you the basics, takes you on a tour of analog and digital components, explains how they work, and shows you how they are combines for various applications. It even includes circuit assembly tips and 100 electronic circuits and projects you can build and test. Even if you're not new to electronics, this book makes a great shop reference.